MCP48FVB08 datasheet(73/112 Pages) MICROCHIP

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DS20006362A-page 73

MCP48FXBX4/8

TABLE 5-5:

DAC INPUT CODE VS. CALCULATED ANALOG OUTPUT (VOUT) (VDD = 5.0V)

Device

Volatile DAC

VRL(1)

LSb

Gain

Selection(2)

VOUT(3)

Equation

µV

Equation

1111 1111 1111

5.0V

5.0V/4096

1,220.7

VRL  (4095/4096)  1

4.998779

2.5V

2.5V/4096

610.4

VRL  (4095/4096)  1

2.499390

2x(2)

VRL  (4095/4096)  2)

4.998779

0111 1111 1111

5.0V

5.0V/4096

1,220.7

VRL  (2047/4096)  1)

2.498779

2.5V

2.5V/4096

610.4

VRL  (2047/4096)  1)

1.249390

2x(2)

VRL  (2047/4096)  2)

2.498779

0011 1111 1111

5.0V

5.0V/4096

1,220.7

VRL  (1023/4096)  1)

1.248779

2.5V

2.5V/4096

610.4

VRL  (1023/4096)  1)

0.624390

2x(2)

VRL  (1023/4096)  2)

1.248779

0000 0000 0000

5.0V

5.0V/4096

1,220.7

VRL  (0/4096) * 1)

2.5V

2.5V/4096

610.4

VRL  (0/4096) * 1)

2x(2)

VRL  (0/4096) * 2)

11 1111 1111

5.0V

5.0V/1024

4,882.8

VRL  (1023/1024)  1

4.995117

2.5V

2.5V/1024

2,441.4

VRL  (1023/1024)  1

2.497559

2x(2)

VRL  (1023/1024)  2

4.995117

01 1111 1111

5.0V

5.0V/1024

4,882.8

VRL  (511/1024)  1

2.495117

2.5V

2.5V/1024

2,441.4

VRL  (511/1024)  1

1.247559

2x(2)

VRL  (511/1024)  2

2.495117

00 1111 1111

5.0V

5.0V/1024

4,882.8

VRL  (255/1024)  1

1.245117

2.5V

2.5V/1024

2,441.4

VRL  (255/1024)  1

0.622559

2x(2)

VRL  (255/1024)  21.245117

00 0000 0000

5.0V

5.0V/1024

4,882.8

VRL  (0/1024)  1

2.5V

2.5V/1024

2,441.4

VRL  (0/1024)  1

2x(2)

VRL  (0/1024)  10

1111 1111

5.0V

5.0V/256

19,531.3

VRL  (255/256)  1

4.980469

2.5V

2.5V/256

9,765.6

VRL  (255/256)  1

2.490234

2x(2)

VRL  (255/256)  2

4.980469

0111 1111

5.0V

5.0V/256

19,531.3

VRL  (127/256)  1

2.480469

2.5V

2.5V/256

9,765.6

VRL  (127/256)  1

1.240234

2x(2)

VRL  (127/256)  2

2.480469

0011 1111

5.0V

5.0V/256

19,531.3

VRL  (63/256)  1

1.230469

2.5V

2.5V/256

9,765.6

VRL  (63/256)  1

0.615234

2x(2)

VRL  (63/256)  2

1.230469

0000 0000

5.0V

5.0V/256

19,531.3

VRL  (0/256)  1

2.5V

2.5V/256

9,765.6

VRL  (0/256)  1

2x(2)

VRL  (0/256)  20

Note 1:

VRL is the resistor ladder’s reference voltage. It is independent of the VRnB:VRnA selection.

Gain selection of 2x (Gx = 1) requires the voltage reference source to come from the VREF pin

(VRnB:VRnA = 10 or 11) and requires a VREF pin voltage (or VRL) ≤ VDD/2, or from the internal band gap

(VRnB:VRnA = 01).

These theoretical calculations do not take into account the offset, gain and nonlinearity errors.

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